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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(y-(7/y))*((5*y)/y-7) = 0
(y-7*y^-1)*((5*y)/y-7) = 0
-2*(y-7*y^-1) = 0
y-7*y^-1 = 0
y^-1*(y^2-7) = 0
1*y^2 = 7 // : 1
y^2 = 7
y^2 = 7 // ^ 1/2
abs(y) = 7^(1/2)
y = 7^(1/2) or y = -7^(1/2)
y^-1*(y-7^(1/2))*(y+7^(1/2)) = 0
-2*y^-1*(y-7^(1/2))*(y+7^(1/2)) = 0
( y+7^(1/2) )
y+7^(1/2) = 0 // - 7^(1/2)
y = -7^(1/2)
( y-7^(1/2) )
y-7^(1/2) = 0 // + 7^(1/2)
y = 7^(1/2)
( y^-1 )
1*y^-1 = 0 // : 1
y^-1 = 0
y naleu017Cy do O
y in { -7^(1/2), 7^(1/2) }
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